Question about Bestec (ATX-250-12E) 250-Watt Power Supply

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Bestec ATX-300-12EB3 just got a new one...Place back in and no power-up. Green light on back of supply and on mother board.but will no do much of anything else.has all the same plugs....shouldn't there be a 12v output or something. any further input would be great...Thanks, Andy

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  • anance Nov 26, 2008

    Green LED on power supply just flashes and computer will not boot.  I tried everything I could think of--swap memory, re-seat cards, different power, etc.

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There should be 12v coming from the yellow wire and 5v from red. Open PC and use a multimeter to check the voltage output connect negative probe to the power supply casing and the positive to the red and yellow wires from the molex connectors. If the readings are below the mentioned voltages then the PSU is faulty. Note if readings can be round off to the given values then the output is fine. cheers.

Posted on Nov 27, 2008

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1 Answer

My smps is working, but my power is not coming to the mother board


Replace the power supply or have it tested.
Amazon com bestec atx 300 12z You can get a replacement pretty cheap. Most all power supplies can also be tested - Bestbuys geek squad or a small computer repair shop should have the means to test it.

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Power supply light flashing green ,,, tried unplugging mother board still flashes green is it the power supply or the mother board?


Most computer testing facilities will test your current power supply for free. A replacement is very inexpensive to replace. Bestbuy, MicroCenter, small computer shops and buy replacemnent from Amazon.com, newegg.com.. Just make sure you have the correct information for your replacement. The model number on the power supply would be your best bet in most cases. Good luck and have a great day. I buy power supplies as low as $15 dollars Generic

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EMachine T6420 will only turn on to start the fans and then immediately turns back off - has Bestec ATX-300-12E power supply - do you think that's the problem


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ok dandan, please tell me you live in nj. I am having the same problem with my puter and did every step you did what is up with this??

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W2888 emachine just shut down as if it were unpluged


THE LITTLE LIGHT ON THE MOTHERBOARD SHOULD ALWAY BE ON. THE FAN ON THE POWER SUPPLY RUNNING NORMAL OR FAST.
DID YOU ADD ANY NEW DEVICES TO YOUR COMPUTER LIKE UPGRADING THE RAM, VIDEO CARD, NEW INPUT DEVICE.

NEED MORE INFORMATION.

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1 Answer

Bestec atx-250-12z rev d hp model 5187-1098 pc will not start up when pushing button on front of machine green led on back of p/s flashes with power cord plugged in. does this indicate a p/s failure?


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If your PSU is off specification ie. more than 5% variance this IS your issue.

FWIW Don't waste your money on another Bestec PSU

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1 Answer

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the mother board can have a short and the green light is on, replace the motherboard. when the power box goes bad, most of the time it shorts the mother board out, this has happened to me a few times. Farren

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